Meaning & use
Pion
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An unstable subatomic particle, composed of a quark and an antiquark, that helps mediate the strong nuclear force binding protons and neutrons.
See it in a sentence
Physicists tracked the decay of the pion in the particle accelerator's detector.
Cosmic rays striking the atmosphere can produce showers of pions.
A note on using this word
Short for 'pi meson'; pions come in three types (positive, negative, and neutral) and were first predicted theoretically before being discovered experimentally in 1947.
Words with a similar meaning
pi meson
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